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LMV321 数据表(PDF) 21 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部件名 LMV321
功能描述  General Purpose, Low Voltage, Rail-to-Rail Output Operational Amplifiers
PDF  27 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LMV321 数据表(HTML) 21 Page - National Semiconductor (TI)

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Application Notes (Continued)
4.9 COMPARATOR WITH HYSTERESIS
The LMV321/358/324 can be used as a low power compara-
tor. Figure 24 shows a comparator with hysteresis. The
hysteresis is determined by the ratio of the two resistors.
V
TH+ =VREF/(1+R 1/R2)+VOH/(1+R2/R1)
V
TH− =VREF/(1+R 1/R2)+VOL/(1+R2/R1)
V
H =(VOH−VOL)/(1+R 2/R1)
where
V
TH+: Positive Threshold Voltage
V
TH−: Negative Threshold Voltage
V
OH: Output Voltage at High
V
OL: Output Voltage at Low
V
H: Hysteresis Voltage
Since
LMV321/358/324
have
rail-to-rail
output,
the
(V
OH−VOL) equals to VS, which is the supply voltage.
V
H =VS/(1+R2/R 1)
The differential voltage at the input of the op amp should not
exceed the specified absolute maximum ratings. For real
comparators that are much faster, we recommend you to use
National’s LMV331/393/339, which are single, dual and quad
general purpose comparators for low voltage operation.
Connection Diagrams
5-Pin SC70-5/SOT23-5
8-Pin SO/MSOP
14-Pin SO/TSSOP
10006001
Top View
10006002
Top View
10006003
Top View
Ordering Information
Package
Temperature Range
Packaging Marking
Transport Media
NSC Drawing
Industrial
−40˚C to +85˚C
5-Pin SC70-5
LMV321M7
A12
1k Units Tape and Reel
MAA05
LMV321M7X
A12
3k Units Tape and Reel
5-Pin SOT23-5
LMV321M5
A13
1k Units Tape and Reel
MA05B
LMV321M5X
A13
3k Units Tape and Reel
8-Pin Small Outline
LMV358M
LMV358M
Rails
M08A
LMV358MX
LMV358M
2.5k Units Tape and Reel
8-Pin MSOP
LMV358MM
LMV358
1k Units Tape and Reel
MUA08A
LMV358MMX
LMV358
3.5k Units Tape and Reel
14-Pin Small Outline
LMV324M
LMV324M
Rails
M14A
LMV324MX
LMV324M
2.5k Units Tape and Reel
14-Pin TSSOP
LMV324MT
LMV324MT
Rails
MTC14
LMV324MTX
LMV324MT
2.5k Units Tape and Reel
10006078
FIGURE 24. Comparator with Hysteresis
www.national.com
21



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